Project.Euler.Problem.8.ps1

function Split-Number {
  param([string]$value)
  $index = 0
  while($index -lt $value.Length - 12) {
    $value.Substring($index++, 13)
  }
}

filter Evaluate-String {
  $_.ToCharArray() | % { [int]::Parse($_) } | % {$total = 1} {$total *= $_} {$total}
}

function Solve-Problem8 {
  $text = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"

  (Split-Number $text | Evaluate-String | Measure-Object -Maximum).Maximum
}

Write-Host "Elapsed Time (s): " (Measure-Command {Solve-Problem8}).TotalSeconds
Write-Host "Solutions: " (Solve-Problem8)

# Elapsed Time (s):  0.763942
# Solution:  23514624000